Black Root Rot of Lathyrus

Disease Information

Black Root Rot

A very widespread soil borne fungus attacking a wide range of plants. Symptoms vary, but in sweet peas it shows as a black discolouration of the roots. Although development of the disease is most rapid in the temperature range 20°c - 25°c it seems to establish itself when a plant is under stress and is favoured by cold wet soils and poor hygiene. Excessively high air temperatures can also render a plant liable to infection. Discouraged by acid soils - it cannot survive in soils with a pH below 5.6. Strongly growing plants can carry a moderate level of infection without showing symptoms

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